regulate Separation Partially folding allen key set I reckon never did it
Heyco Hex Metric L-key Folding Set in Metal Holder, 6 Pieces
Fold-up Allen Wrench Set, Metric, 7-Piece | Ruland
Folding SAE Hex Key Wrench Set
KLEIN TOOLS Folding Hex-Key Wrenches | Tallman Equipment Company
STANLEY 2-69-264 8 Piece Metric Folding Hex Key Set (12 pcs.) | Mister Worker®
Hex key wrench set (folding) 7-pcs. - Sonic Tools
GEARWRENCH SAE, Metric, & Torx® Folding Hex Key Set (25-Piece) 83512 - The Home Depot
Topline 25-Piece Folding Allen Wrench Set, SAE, Metric, Torx Hex Key Set Included, 3 Pack Portable Allen Key Set for Basic Home Repair and General Applications - Amazon.com
STERITOOL INC - #12000 - Stainless Steel 9 pc Inch Folding Hex Key Set: 1/16" ~ 1/4". #12000
Klein Tools Pro Folding Hex Key Set, 11-Key, SAE Sizes 70550 - The Home Depot